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lesya692 [45]
2 years ago
9

How many significant figures are in 4.800x10-3?​

Chemistry
1 answer:
seraphim [82]2 years ago
5 0
4 after solving =0.004800 where 4,800 is the significant number
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Identify each element below, and give the symbols of the other elements in its group:
Misha Larkins [42]

Answer:

Answer in explanation

Explanation:

a. Boron , element 5

Helium has 2 electrons, add to the other 3 to give 5.

Other group members are : Aluminum Al, Gallium Ga, Indium In , Thallium Tl and Nihonium Nh

b. Sulphur, element 16

Neon is 10 , add other 6 electrons to make 16

Other group members are: Oxygen O, selenium Se , Tellurium Te and Polonium Po

c. Lanthanum, element 57

Xenon is 54, add the other 3 electrons to give 57.

Other elements in group : Scandium Sc , Yttrium Y , Actinium Ac, Lutetium Lu and/or Lawrencium Lr

4 0
3 years ago
HELP FAST PLZ!!!!
amm1812
I would say letter D.
A is biology.
Ecology has to do with distribution of  animals.
8 0
3 years ago
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C2H5OH( l) + 3O2( g) → 2CO2( g) + 3H2O( l); Δ H = –1.37 × 103 kJ Consider the following propositions: I. The reaction is endothe
Svetlanka [38]

Answer:

II. The reaction is exothermic.

III. The enthalpy term would be different if the water formed was gaseous.

Explanation:

For the reaction:

C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l)

The  ΔH is -1.37×10³ kJ. As the change in enthalpy is <0,<em> II. The reaction is exothermic.</em>

The ΔH formation of a compound is different if the chemical is in liquid or gaseous phase. For that reason: <em>III. The enthalpy term would be different if the water formed was gaseous.</em>

<em></em>

I hope it helps!

3 0
3 years ago
What is the concentration of H+ ions at a pH = 2?
kari74 [83]

<h2><u>PLEASE MARK BRAINLIEST!</u></h2>

In Step 5, you will calculate H+/OH– ratios for more extreme pH solutions. Find the concentration of H+ ions to OH– ions listed in Table B of your Student Guide for a solution at a pH = 2. Then divide the H+ concentration by the OH– concentration. Record these concentrations and ratio in Table C.

What is the concentration of H+ ions at a pH = 2?

<h3>0.01   mol/L  </h3>

What is the concentration of OH– ions at a pH = 2?

<h3>0.000000000001   mol/L   </h3>

What is the ratio of H+ ions to OH– ions at a pH = 2?

<h3> 10,000,000,000 : 1</h3>

<em>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</em>

Those are your correct answers on edg2020!

I LITERALLY spent 40 MINUTES trying to figure out this question, so please, use my VERY CORRECT answers!

<em>I hope this helps!</em>

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3 years ago
This is a model of a normal chromosome
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A normal chromosome has two pairs, both the same size.
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